Merge pull request #167 from cabinetoffice/holding-page

Holding page

Author: rmohammed-goaco

aws/README.md

@@ -0,0 +1,128 @@
+# CloudFront Holding Page Runbook
+
+This folder contains helper scripts used to switch Find a Grant between live origins and a static S3 holding page, and to update the holding page content.
+
+## Script locations
+
+- Runtime scripts are in `gap-find-web/aws/s3/`
+
+## First stage: download scripts in CloudShell
+
+Start by copying the latest scripts from S3 into your current CloudShell directory:
+
+```bash
+aws s3 cp "s3://gap-setup-holding-page" . --recursive
+```
+
+## Environments and IDs
+
+| Environment | CloudFront distribution ID | Holding page S3 bucket | Holding page origin |
+|---|---|---|---|
+| `qa` | `E2YMATUXLSFFJV` | `gap-qa-holding-page` | `gap-qa-holding-page.s3-website.eu-west-2.amazonaws.com` |
+| `prod` | `E3GJQ1JB1DFNU4` | `gap-prod-holding-page` | `gap-prod-holding-page.s3-website.eu-west-2.amazonaws.com` |
+
+## What the switch scripts change
+
+`switch-to-holding-page.sh` updates these cache behaviors to point to the holding page origin:
+
+- `/`
+- `/*`
+- `/grants/*`
+- `/apply/applicant`
+- `/apply/applicant/*`
+- `/apply/admin`
+- `/apply/admin/*`
+
+It also:
+
+- Forces those switched behaviors to use GET-only methods (`HEAD`, `GET`, `OPTIONS`)
+- Adds/overwrites a CloudFront custom error for `404 -> /index.html` with response code `200`
+- Creates a full cache invalidation for `/*`
+
+`switch-to-live.sh` reverses this:
+
+- Restores the switched behaviors to live origins (`find-lb` or `apply-lb` depending on path)
+- Restores allowed methods per behavior (`7 methods` for apply paths, `3 methods` for find paths)
+- Removes the `404 -> /index.html` custom error response
+- Creates a full cache invalidation for `/*`
+
+Both switch scripts prompt for `qa` or `prod`, include explicit confirmation prompts, and create a timestamped backup file (`dist-backup-YYYYMMDD-HHMMSS.json`) before making changes.
+
+## Scripts
+
+### `s3/switch-to-holding-page.sh`
+
+Switches selected paths to the S3 holding page for the chosen environment (`qa` or `prod`), then invalidates CloudFront.
+
+```bash
+sh ./switch-to-holding-page.sh
+```
+
+### `s3/switch-to-live.sh`
+
+Restores selected paths to live load balancer origins for the chosen environment (`qa` or `prod`), then invalidates CloudFront.
+
+```bash
+sh ./switch-to-live.sh
+```
+
+### `s3/restore-from-backup.sh` - Be careful with this!
+
+Restores from a backup file and invalidates CloudFront.
+Prompts for environment (`qa` or `prod`) before restoring.
+
+```bash
+sh ./restore-from-backup.sh dist-backup-20260414-162948.json
+```
+
+If run without an argument, it prints usage and available backup files.
+
+### `s3/update-holding-page.sh`
+
+Updates `holding-page/index.html`, uploads the generated page to the selected environment bucket (`qa` or `prod`), and invalidates `/index.html`.
+
+What it prompts for:
+
+- Environment (`qa`/`prod`)
+- Optional custom page message (defaults to `Please try again later.`)
+- Confirmation (plus an extra production warning prompt for `prod`)
+
+```bash
+sh ./update-holding-page.sh
+```
+
+### `s3/clear-cache-invalidate.sh`
+
+Prompts for environment (`qa` or `prod`) and creates a full invalidation (`/*`) for that distribution.
+
+```bash
+sh ./clear-cache-invalidate.sh
+```
+
+## Suggested maintenance procedure
+
+1. Update the holding page content first (optional):
+   ```bash
+   sh ./update-holding-page.sh
+   ```
+2. Switch traffic to the holding page:
+   ```bash
+   sh ./switch-to-holding-page.sh
+   ```
+3. Verify key URLs show the holding page.
+4. Perform maintenance.
+5. Switch traffic back to live:
+   ```bash
+   sh ./switch-to-live.sh
+   ```
+6. Verify live traffic is restored.
+
+## Recovery procedure
+
+If needed, restore from a known backup file - Be very careful though!
+
+```bash
+sh ./restore-from-backup.sh dist-backup-YYYYMMDD-HHMMSS.json
+```
+
+Note: `restore-from-backup.sh` fetches the current ETag before update, so backup-file ETag staleness is not a problem.

aws/s3/clear-cache-invalidate.sh

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+#!/bin/bash
+
+set -e
+
+# Prompt for environment
+while true; do
+  read -rp "Which environment do you want to use? (qa/prod): " ENVIRONMENT
+  case "$ENVIRONMENT" in
+    qa|prod) break ;;
+    *) echo "Invalid option. Please enter 'qa' or 'prod'." ;;
+  esac
+done
+
+# Set environment-specific values
+if [ "$ENVIRONMENT" = "prod" ]; then
+  DIST_ID="E3GJQ1JB1DFNU4"
+else
+  DIST_ID="E2YMATUXLSFFJV"
+fi
+
+# Extra warning for prod
+if [ "$ENVIRONMENT" = "prod" ]; then
+  echo ""
+  echo "WARNING: You have selected the PRODUCTION environment. This will affect live users."
+  read -rp "Are you sure you want to continue? (y/n): " PROD_CONFIRM
+  if [ "$PROD_CONFIRM" != "y" ]; then
+    echo "Aborted."
+    exit 0
+  fi
+fi
+
+echo ""
+read -rp "You are about to create a full cache invalidation in the $ENVIRONMENT environment. Are you sure? (y/n): " CONFIRM
+if [ "$CONFIRM" != "y" ]; then
+  echo "Aborted."
+  exit 0
+fi
+
+echo "Creating cache invalidation for $ENVIRONMENT..."
+INVALIDATION=$(aws cloudfront create-invalidation \
+  --distribution-id "$DIST_ID" \
+  --paths "/*" \
+  --query 'Invalidation.Id' \
+  --output text)
+echo "Invalidation created: $INVALIDATION"

aws/s3/holding-page/index.html

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+<!DOCTYPE html>
+<html lang="en" class="govuk-template">
+
+<head>
+  <meta charset="utf-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover" />
+  <meta name="theme-color" content="#0b0c0c" />
+  <title>Sorry, the service is unavailable – Find a grant</title>
+  <link rel="stylesheet" type="text/css" href="https://test-env.find-a-grant-support-test.service.cabinetoffice.gov.uk/style.css" />  
+</head>
+
+<body class="govuk-template__body js-enabled">
+
+  <a href="#main-content" class="govuk-skip-link" data-module="govuk-skip-link">
+    Skip to main content
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+          </span>
+        </a>
+      </div>
+      <div class="govuk-header__content">
+        <div class="govuk-heading-m gap-service-name">Find a grant</div>
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+          <h1 class="govuk-heading-l">Sorry, the service is unavailable</h1>
+
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